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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14285
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Fri Apr 20, 2018 3:26 pm    Post subject: Steve Wright's Serious Moddin' - SSK solid bush/bearing Reply with quote

It's Friday, it's Sunny, Steve Wright's Serious Jockin' is on the Radio. There's only one thing for it - Serious Moddin'!

Due to 911uk peer pressure, sloppy bushes and the need to keep myself busy when work load is sparse I've started attacking the cheap eBay Short Shift Kit with the end result being solid oilite bearings and Phosphor Bronze bushes (yes that's bushes, not bushings as some of you guys like to refer them as) instead of the poor needle bearing and plastic bushes the kit comes with fitted.

So, this breaks down in to two part - Part 1, replacement of the badly spec'd needle bearing that runs on a 10mm shaft through the centre. This is the part the lever rotates on in the up/down movement, ie. 1st to 2nd, 3rd to 4th, 5th to 6th. Part 2 - replacement of the plastic bushes that the whole cradle rotates on that are fitted in the gear shifter assembly. The cradle rotates on these for the left/right movement, so moving over from 2nd to 3rd, 4th to 5th, reverse, etc.

The end result should be a full shifter assembly with no play in it created by poor manufacturing tolerances and clearances, ensuring that the lever is rock solid in the assembly and any movement from the operator transfers directly to what happens at the gearbox end and thus results in Sniper accuracy and selection for all you sharp shooters out there, hopefully transferring your driving ability from Shooter to Driving


Part 1

Replacement of the central needle bearing with self lubricating solid bearings.


See here the issue with the poor quality needle bearing. The lever is allowed to rock on the central shaft as there's too much clearance between shaft and bearing:


Open Youtube Page




This bearing is just pressed in the leaver, so easily pressed out ready for the solid bearings. I've spec'd the bearing but need to modify them slightly on my lathe so once pressed in, the overall width of the bearings in the leaver are a nice snug fit in the aperture in the cradle. The bearings are also a perfect fit on the shft so no excessive play is evident (as seen in the above clip). Here's with the solid bearings fit and as you can see, no rocking about, only perfect rotational movement.


Open Youtube Page



Seen here, nice and solid and should outlast the car's life.






The central assembly (lever and cradle) are now assembly back together ready for part 2.



Part 2

Replacement of the plastic bushes with solid bearings.

Now this is where it started to get complicated and I soon realised why the plastic bushes (which I originally thought were ok for the job) are like they are and not the perfect solution.

Here you can see the clearance between the upper and lower cradle pivot shafts and the plastic bushes. When measuring, clearance between them was up to 0.5mm Surprised when in reality 0.05mm would've been somewhere near acceptable.


Open Youtube Page



It was only at this point that I thought I better check out the upper and lower shafts in the cradle for being concentric to each other (ie. in line with each other so they rotate on the same virtual centre line). WTF? These things are a back yard out. No wonder they need so much clearance in the plastic bearings otherwise these things would just lock up.

I've made a video here in my lathe clamping on one of the shafts and then witnessing how far the other end is running out. Remember guys - CNC machined doesn't mean ACCURACY!!!!! That's all down to the person using it.

Notice the outer side face of the cradle running perfectly true, whilst the shaft is bobbing up and down like brides nightie:


Open Youtube Page



So I've had to take a skim off this and reduce the shaft down in size to ensure it's running concentric with the opposite end. See here now I've reduced the diameter and got it running how it should (it's running that true you can't tell it's spinning):


Open Youtube Page



Once that's sorted, time to take a few measurements, jump on the lathe with a Phosphor Bronze bar and machine some solid bushes (to 0.01mm accuracy for perfect movement when assembled).







And hey presto, ready for assembly.




All back together and a few snazzy snaps before fitting back in the car.






Now back in the motor and re-assembled back in the full assembly.






......and a quick dress rehearsal before jumping in and taking if for a spin. Gear stick is now rock solid and any movement between lever and Gearbox leavers is free from any play created by the original SSK. thumbsup


Open Youtube Page



Right, what am I doing dicking about on here writing this? I should be in a beer garden doing some Steve Wright's Serious Boozin'

Abientot mon Amis!!!!!!!! Drinkers
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maldren
Österreich


Joined: 07 Oct 2016
Posts: 923



PostPosted: Fri Apr 20, 2018 4:00 pm    Post subject: Reply with quote

Looks great Alex. For me, the question is do I go for this or your 997 modification.

My gearshift is a little tight when cold but otherwise ok but I'm sure a modified shorter shift will be more precise.

Having not tried either, are you in a position to compare and contrast? Do you know how far the throws are for the two options?

thanks
Mike
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2003 996.2 C2 Coupe Arctic Silver
 
  
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Phil 997
Brands Hatch
Brands Hatch


Joined: 05 Dec 2015
Posts: 14429
Location: Bournemouth,Dorset

2009 Porsche 997 Carrera 4S

PostPosted: Fri Apr 20, 2018 4:03 pm    Post subject: Reply with quote

Great thread Alex, those two vids showing the bobbing up and down like a brides nighty v how it looks after you machines it is amazing.

We have to call them bushings down here as a too many bush references would tempt the pics Floor Grin I dont actually think bushings is a real word Floor

Looking forward to when your ready to sell them mate. Thumb hopefully I am quite high on the list Grin Thumb

enjoy your beer Cheers
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Chief
Magny-Cours


Joined: 16 Sep 2010
Posts: 2669
Location: The Middle lands


PostPosted: Fri Apr 20, 2018 4:12 pm    Post subject: Reply with quote

Brilliant work!
I love an engineered solution to a cost cutting exercise Thumb
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14285
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Fri Apr 20, 2018 4:45 pm    Post subject: Reply with quote

Will do!


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kas750
Reims


Joined: 31 Mar 2013
Posts: 4061
Location: Chorley lancashire

2006 Porsche 911

PostPosted: Fri Apr 20, 2018 4:51 pm    Post subject: Reply with quote

Top work Alex Thumb
 
  
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FZP
Magny-Cours


Joined: 18 Jan 2015
Posts: 2572
Location: Cheshire


PostPosted: Fri Apr 20, 2018 5:11 pm    Post subject: Reply with quote

Solid work mate. Look forward to seeing it at the pub during next month's coffee catch up
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14285
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Fri Apr 20, 2018 5:21 pm    Post subject: Reply with quote

Pub? Now that's what I'm talking about Thumb
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Last edited by alex yates on Sat Apr 21, 2018 6:44 am; edited 1 time in total
 
  
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Dammit
Kyalami


Joined: 23 Sep 2016
Posts: 1839



PostPosted: Fri Apr 20, 2018 5:23 pm    Post subject: Reply with quote

Something very pleasing about the second lathe clip.

Would your modifications to a standard 997 shifter move it too/beyond the precision of the 997.2 GT3 shifter, which everyone talks about being the benchmark?

= my understanding (which may be imperfect) is that said shifter is stock 997 but with better/solid bearings/bushings.
 
  
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14285
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Fri Apr 20, 2018 5:31 pm    Post subject: Reply with quote

From what I've read and seen, this mod takes it beyond everything, so yes.

I was having a good browse last night and the companies who do solid stuff don't even use the right materials. But they love writing shoite like CNC machined & stealth black. Grin
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ragpicker
Estoril


Joined: 14 Apr 2013
Posts: 3666
Location: North East England


PostPosted: Fri Apr 20, 2018 5:47 pm    Post subject: Reply with quote

Cracking stuff again dude!

It looks so precise that it would feel abnormal using it. There's usually a bit of slack in every box, if you know what I mean Embarassed
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14285
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Fri Apr 20, 2018 6:00 pm    Post subject: Reply with quote

Just in from the boozer. This thing is proper point and press! didn't miss a gear, even after the 4th!!!


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rhino-man
Monza


Joined: 17 Oct 2015
Posts: 231
Location: Kent


PostPosted: Fri Apr 20, 2018 7:58 pm    Post subject: Reply with quote

What are you going to offer us for purchase then Alex?

Our 996 is 120k miles so gear change is past its best even with new engine and transmission mounts and fresh oil so this is the next mod on my list.
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14285
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Fri Apr 20, 2018 8:03 pm    Post subject: Reply with quote

I'm working on it. Watch this space.
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MisterCorn
Long Beach


Joined: 08 Jan 2011
Posts: 6250
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Fri Apr 20, 2018 8:35 pm    Post subject: Reply with quote

That looks like a top job. Are you going to look at doing anything for the plastic piece which translates the left-right movement of the lever in to forwards-backwards movement on the cable? This always appears to have plenty of slop in it.

MC
 
  
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14285
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Fri Apr 20, 2018 8:45 pm    Post subject: Reply with quote

Will look in to it. As yet any current solutions I've seen don't look too clever. I'll come up with a really cheap natural solution that pisses on their parade.
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kurlykris
Watkins Glen


Joined: 30 Jun 2014
Posts: 2206
Location: Warwickshire


PostPosted: Fri Apr 20, 2018 9:19 pm    Post subject: Reply with quote

Nice work Alex Thumb
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Cybot7
Trainee


Joined: 17 Dec 2017
Posts: 92
Location: Cobham, Surrey

2001 Porsche 996 Carrera 2

PostPosted: Sat Apr 21, 2018 6:49 am    Post subject: Reply with quote

I’m impressed. Great bit of engineering.
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wasz
Magny-Cours


Joined: 28 Dec 2012
Posts: 2627


1999 Porsche 996 Carrera 2

PostPosted: Sat Apr 21, 2018 7:56 am    Post subject: Reply with quote

Nice work! There is a guy on boxa.net doing something similar:

http://www.boxa.net/forum/topic/68109-quick-shift-kits/?page=4
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14285
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Sat Apr 21, 2018 7:58 am    Post subject: Reply with quote

wasz wrote:
Nice work! There is a guy on boxa.net doing something similar:

http://www.boxa.net/forum/topic/68109-quick-shift-kits/?page=4


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